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![Junio C Hamano](/assets/img/avatar_default.png)
This new flag tells git-update-cache to remove the named path even when the work tree still happens to have the file. It is used to update git-merge-one-file-script not to smudge the work tree. Signed-off-by: Junio C Hamano <junkio@cox.net>
337 lines
7.4 KiB
C
337 lines
7.4 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include <signal.h>
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#include "cache.h"
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/*
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* Default to not allowing changes to the list of files. The
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* tool doesn't actually care, but this makes it harder to add
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* files to the revision control by mistake by doing something
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* like "update-cache *" and suddenly having all the object
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* files be revision controlled.
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*/
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static int allow_add = 0, allow_remove = 0, not_new = 0;
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/* Three functions to allow overloaded pointer return; see linux/err.h */
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static inline void *ERR_PTR(long error)
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{
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return (void *) error;
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}
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static inline long PTR_ERR(const void *ptr)
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{
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return (long) ptr;
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}
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static inline long IS_ERR(const void *ptr)
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{
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return (unsigned long)ptr > (unsigned long)-1000L;
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}
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/*
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* This only updates the "non-critical" parts of the directory
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* cache, ie the parts that aren't tracked by GIT, and only used
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* to validate the cache.
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*/
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static void fill_stat_cache_info(struct cache_entry *ce, struct stat *st)
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{
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ce->ce_ctime.sec = htonl(st->st_ctime);
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ce->ce_mtime.sec = htonl(st->st_mtime);
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#ifdef NSEC
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ce->ce_ctime.nsec = htonl(st->st_ctim.tv_nsec);
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ce->ce_mtime.nsec = htonl(st->st_mtim.tv_nsec);
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#endif
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ce->ce_dev = htonl(st->st_dev);
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ce->ce_ino = htonl(st->st_ino);
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ce->ce_uid = htonl(st->st_uid);
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ce->ce_gid = htonl(st->st_gid);
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ce->ce_size = htonl(st->st_size);
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}
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static int add_file_to_cache(char *path)
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{
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int size, namelen;
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struct cache_entry *ce;
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struct stat st;
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int fd;
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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if (errno == ENOENT || errno == ENOTDIR) {
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if (allow_remove)
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return remove_file_from_cache(path);
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}
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return -1;
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}
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if (fstat(fd, &st) < 0) {
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close(fd);
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return -1;
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}
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namelen = strlen(path);
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size = cache_entry_size(namelen);
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ce = xmalloc(size);
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memset(ce, 0, size);
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memcpy(ce->name, path, namelen);
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fill_stat_cache_info(ce, &st);
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ce->ce_mode = create_ce_mode(st.st_mode);
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ce->ce_flags = htons(namelen);
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if (index_fd(ce->sha1, fd, &st) < 0)
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return -1;
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return add_cache_entry(ce, allow_add);
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}
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static int match_data(int fd, void *buffer, unsigned long size)
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{
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while (size) {
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char compare[1024];
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int ret = read(fd, compare, sizeof(compare));
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if (ret <= 0 || ret > size || memcmp(buffer, compare, ret))
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return -1;
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size -= ret;
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buffer += ret;
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}
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return 0;
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}
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static int compare_data(struct cache_entry *ce, unsigned long expected_size)
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{
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int match = -1;
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int fd = open(ce->name, O_RDONLY);
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if (fd >= 0) {
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void *buffer;
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unsigned long size;
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char type[10];
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buffer = read_sha1_file(ce->sha1, type, &size);
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if (buffer) {
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if (size == expected_size && !strcmp(type, "blob"))
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match = match_data(fd, buffer, size);
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free(buffer);
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}
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close(fd);
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}
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return match;
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}
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/*
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* "refresh" does not calculate a new sha1 file or bring the
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* cache up-to-date for mode/content changes. But what it
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* _does_ do is to "re-match" the stat information of a file
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* with the cache, so that you can refresh the cache for a
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* file that hasn't been changed but where the stat entry is
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* out of date.
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*
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* For example, you'd want to do this after doing a "read-tree",
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* to link up the stat cache details with the proper files.
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*/
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static struct cache_entry *refresh_entry(struct cache_entry *ce)
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{
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struct stat st;
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struct cache_entry *updated;
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int changed, size;
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if (stat(ce->name, &st) < 0)
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return ERR_PTR(-errno);
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changed = cache_match_stat(ce, &st);
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if (!changed)
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return ce;
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/*
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* If the mode has changed, there's no point in trying
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* to refresh the entry - it's not going to match
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*/
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if (changed & MODE_CHANGED)
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return ERR_PTR(-EINVAL);
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if (compare_data(ce, st.st_size))
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return ERR_PTR(-EINVAL);
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size = ce_size(ce);
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updated = xmalloc(size);
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memcpy(updated, ce, size);
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fill_stat_cache_info(updated, &st);
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return updated;
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}
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static int refresh_cache(void)
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{
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int i;
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int has_errors = 0;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce, *new;
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ce = active_cache[i];
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if (ce_stage(ce)) {
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printf("%s: needs merge\n", ce->name);
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has_errors = 1;
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while ((i < active_nr) &&
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! strcmp(active_cache[i]->name, ce->name))
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i++;
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i--;
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continue;
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}
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new = refresh_entry(ce);
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if (IS_ERR(new)) {
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if (!(not_new && PTR_ERR(new) == -ENOENT)) {
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printf("%s: needs update\n", ce->name);
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has_errors = 1;
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}
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continue;
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}
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active_cache[i] = new;
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}
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return has_errors;
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}
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/*
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* We fundamentally don't like some paths: we don't want
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* dot or dot-dot anywhere, and in fact, we don't even want
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* any other dot-files (.git or anything else). They
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* are hidden, for chist sake.
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*
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* Also, we don't want double slashes or slashes at the
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* end that can make pathnames ambiguous.
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*/
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static int verify_path(char *path)
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{
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char c;
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goto inside;
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for (;;) {
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if (!c)
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return 1;
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if (c == '/') {
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inside:
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c = *path++;
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if (c != '/' && c != '.' && c != '\0')
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continue;
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return 0;
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}
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c = *path++;
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}
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}
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static int add_cacheinfo(char *arg1, char *arg2, char *arg3)
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{
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int size, len;
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unsigned int mode;
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unsigned char sha1[20];
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struct cache_entry *ce;
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if (sscanf(arg1, "%o", &mode) != 1)
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return -1;
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if (get_sha1_hex(arg2, sha1))
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return -1;
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if (!verify_path(arg3))
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return -1;
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len = strlen(arg3);
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size = cache_entry_size(len);
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ce = xmalloc(size);
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memset(ce, 0, size);
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memcpy(ce->sha1, sha1, 20);
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memcpy(ce->name, arg3, len);
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ce->ce_flags = htons(len);
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ce->ce_mode = create_ce_mode(mode);
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return add_cache_entry(ce, allow_add);
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}
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static const char *lockfile_name = NULL;
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static void remove_lock_file(void)
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{
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if (lockfile_name)
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unlink(lockfile_name);
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}
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static void remove_lock_file_on_signal(int signo)
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{
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remove_lock_file();
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}
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int main(int argc, char **argv)
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{
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int i, newfd, entries, has_errors = 0;
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int allow_options = 1;
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static char lockfile[MAXPATHLEN+1];
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const char *indexfile = get_index_file();
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snprintf(lockfile, sizeof(lockfile), "%s.lock", indexfile);
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newfd = open(lockfile, O_RDWR | O_CREAT | O_EXCL, 0600);
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if (newfd < 0)
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die("unable to create new cachefile");
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signal(SIGINT, remove_lock_file_on_signal);
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atexit(remove_lock_file);
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lockfile_name = lockfile;
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entries = read_cache();
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if (entries < 0)
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die("cache corrupted");
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for (i = 1 ; i < argc; i++) {
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char *path = argv[i];
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if (allow_options && *path == '-') {
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if (!strcmp(path, "--")) {
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allow_options = 0;
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continue;
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}
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if (!strcmp(path, "--add")) {
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allow_add = 1;
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continue;
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}
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if (!strcmp(path, "--remove")) {
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allow_remove = 1;
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continue;
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}
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if (!strcmp(path, "--refresh")) {
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has_errors |= refresh_cache();
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continue;
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}
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if (!strcmp(path, "--cacheinfo")) {
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if (i+3 >= argc || add_cacheinfo(argv[i+1], argv[i+2], argv[i+3]))
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die("update-cache: --cacheinfo <mode> <sha1> <path>");
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i += 3;
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continue;
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}
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if (!strcmp(path, "--force-remove")) {
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if (argc <= i + 1)
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die("update-cache: --force-remove <path>");
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if (remove_file_from_cache(argv[i+1]))
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die("update-cache: --force-remove cannot remove %s", argv[i+1]);
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i++;
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continue;
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}
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if (!strcmp(path, "--ignore-missing")) {
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not_new = 1;
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continue;
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}
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die("unknown option %s", path);
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}
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if (!verify_path(path)) {
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fprintf(stderr, "Ignoring path %s\n", argv[i]);
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continue;
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}
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if (add_file_to_cache(path))
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die("Unable to add %s to database", path);
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}
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if (write_cache(newfd, active_cache, active_nr) || rename(lockfile, indexfile))
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die("Unable to write new cachefile");
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lockfile_name = NULL;
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return has_errors;
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}
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